You'll need to basically take the everything from the engine compartment of the 97 explorer and swap it over to your truck.
Plus ou'll need the exhaust(at least to the catalytic convertor), need to find a way to adapt the evap system, and pcm of coarse.
Then, good luck when it comes to the plug on the fire wall. Lots of splicing. As the earlier Rangers use a round plug and the later Rangers and explorers use a more rectangle plug.
There is just alot of differences between the OBD-I 93-94 Rangers, and the later 95-97 Rangers and Explorers. They changed alot of stuff.